No video and keeps rebooting after short run

erena · Jan 4, 2014

Hello. Recently I built a new PC system: i3-4130, ASRock B85M Pro4, Corsair CX500, Crucial 8G memory, Sapphire HD 7870, Sandisk UltraPlus 128G SSD.

The system was running fine when I assembled them up for the first time and I was then installing an operating system. However suddenly the the screen went black, and the system seemed to start keeping rebooting regularly. No video output were detected after the fault.

Then I opened the case and disconnected the video card and the hard drive, and tried a breadboard system with only CPU and memory attached to the motherboard. I noticed that when I turned on the power, all the fans were going as normally, but there was no video output. After around 1 minute, all fans stopped. Then one second after, all fans started to working again. It seemed the system went through a reboot automatically. This whole procedure kept repeating.

I tried resetting the CMOS which didn't work. Also I was pretty sure that the 8-pin CPU power connector was correctly connected.

Since there were only CPU, motherboard, memory, and power supply involved in the breadboard, there must be one broken among them. I tried to detach the memory as well and the system still kept rebooting, so I assumed it was not due to the memory. Originally I suspected my motherboard was down. However when I replaced the motherboard with a new one, the fault remained the same. After that I replaced my power supply with a new Corsair CX 430, and again the fault remained the same.

It seems to me that the only thing left is a broken CPU, which can rarely happen. I wonder if there is something I was missing.

Thanks.

scoobydenon · Jan 4, 2014

Did you take the memory out and put it back in and re-try? Make sure they are in the right slots, make sure you hear them click into place and try one more time.

erena · Jan 4, 2014

scoobydenon :

Yes, I did heard two clicks when installing the memory. I also tried completely removing the memory, and the system was still rebooting all the way. It's weird that the new system was at first functioning and then suddenly went dead.

Shaun o · Jan 4, 2014

From what your describing, the board is having a problem trying to Id the Cpu.
Since it need it to perform the rest of the functions to power on self test in the bios.
It needs to know what it is then set the bus speed, cpu clock frequency and dividers, memory speed.

First of all take your cooler off and unlock the cpu socket.
Examine all the contacts and look for any that may be bent in the cpu socket, or slightly miss aligned.
This can happen when you have tightened the cpu cooler too hard on to the cpu.
as everything heats up it expands and contracts because you have two metals aluminum and copper in contact.

They expand at different rates. It is one of the reasons you never over tighten a cpu cooler. and the right amount of tension is always stated. They need to slip past each other a bit.
Or friction can cause a stress or the pins or socket to move.

That was a warning.

Now if the board has a on board speaker and you can here one beep it means the system is fine.
You said you were installing windows, so if it got to the point where it said it was restarting.
Then it exhibited the behavior it is because the board cannot find a monitor attached to the default monitor output display port.

And the cause of the fans spinning, a black screen and restart.

You need to connect the cable if connected to the 7870 card to the motherboard. via the Vga or Dvi port of the board.
Then you need to go into the bios of the board and set the graphics option to Pci-e or peg.
And if you can turn off on board graphics.

Save the settings in the bios, then exit and swap the cable back to the 7870 card.
Some boards after installing windows, and doing a restart.
Exhibit the behavior because as part of the post there is a check for a video feed from the graphics port to a monitor.

If it is not connected to the right output port you get what you are seeing.
So have a check.

erena · Jan 4, 2014

Shaun o :

I intend to do this check tomorrow.

Shaun o :

I don't think it does, nor does the case. I plan to get one if needed.

Shaun o :

During the breadboard test, the monitor was connected through the DVI port of the motherboard, and there was no display detected, so there was no chance I could change BIOS configurations.

Thank you.

erena · Jan 4, 2014

Shaun o :

From what your describing, the board is having a problem trying to Id the Cpu.
Since it need it to perform the rest of the functions to power on self test in the bios.
It needs to know what it is then set the bus speed, cpu clock frequency and dividers, memory speed.

First of all take your cooler off and unlock the cpu socket.
Examine all the contacts and look for any that may be bent in the cpu socket, or slightly miss aligned.
This can happen when you have tightened the cpu cooler too hard on to the cpu.
as everything heats up it expands and contracts because you have two metals aluminum and copper in contact.

They expand at different rates. It is one of the reasons you never over tighten a cpu cooler. and the right amount of tension is always stated. They need to slip past each other a bit.
Or friction can cause a stress or the pins or socket to move.

That was a warning.

Now if the board has a on board speaker and you can here one beep it means the system is fine.
You said you were installing windows, so if it got to the point where it said it was restarting.
Then it exhibited the behavior it is because the board cannot find a monitor attached to the default monitor output display port.

And the cause of the fans spinning, a black screen and restart.

You need to connect the cable if connected to the 7870 card to the motherboard. via the Vga or Dvi port of the board.
Then you need to go into the bios of the board and set the graphics option to Pci-e or peg.
And if you can turn off on board graphics.

Save the settings in the bios, then exit and swap the cable back to the 7870 card.
Some boards after installing windows, and doing a restart.
Exhibit the behavior because as part of the post there is a check for a video feed from the graphics port to a monitor.

If it is not connected to the right output port you get what you are seeing.
So have a check.

I checked this morning and there were no bent pins in the socket that I was aware of.

erena · Jan 10, 2014

The issue was due to the incompatibility between ASRock B85m motherboard and Crucial memory. Moving the memory into B1 or B2 slot will let the system post, and then flash an updated BIOS will completely resolve this issue.

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